Los Angeles ozone levels – 30th anniversary revisit

October 5, 2017
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The movie Blade Runner came out about 30 years ago, portraying a dystopian future set in 2019 Los Angeles. Many of the technology predictions in the movie have actually become reality - but how about the weather and pollution? The movie was all about smog and a lack of sunshine, and I wondered

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Create and interpret a weighted histogram

October 4, 2017
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Create and interpret a weighted histogram

If you perform a weighted statistical analysis, it can be useful to produce a statistical graph that also incorporates the weights. This article shows how to construct and interpret a weighted histogram in SAS. How to construct a weighted histogram Before constructing a weighted histogram, let's review the construction of

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Trends in U.S. refugee admissions

October 3, 2017
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"Coming to America" - it's been the name of a funny movie and a dramatic song (can you name the actor & singer without cheating?!?) It's also been a dream for many, and an action for some. People have been coming to America both legally and illegally for many years, but there's one special category

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How to understand weight variables in statistical analyses

October 2, 2017
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How to understand weight variables in statistical analyses

How can you specify weights for a statistical analysis? Hmmm, that's a "weighty" question! Many people on discussion forums ask "What is a weight variable?" and "How do you choose a weight for each observation?" This article gives a brief overview of weight variables in statistics and includes examples of

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SAS Management Console on HiDPI Windows 10

September 29, 2017
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A few days ago I installed SAS Management Console 9.4 M4 and Metacoda Plug-ins 6.0 R4 on a Microsoft Surface Pro running Windows 10. After launching SAS Management Console, and logging in, it looked very odd. All of the icons and text were very close together and the text was hard to read. Here’s...
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SAS and sports analytics (plotting kayak/SUP race results)

September 28, 2017
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I recently paddled in a boat race, and was wondering how I did compared to all the other paddlers. And being a Graph Guy, I decided I should find a cool way to graph the data ... Here's some background information ... There's a great organization calle...
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Most popular international destination, from each US state

September 27, 2017
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Orbitz recently published a map showing the most popular international travel destination for each of the 50 US states. It was an interesting map ... but of course, me being the Graph Guy, I had to pick it apart and create my own version. Follow along,...
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Data-driven simulation

September 27, 2017
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Data-driven simulation

In a large simulation study, it can be convenient to have a "control file" that contains the parameters for the study. My recent article about how to simulate multivariate normal clusters demonstrates a simple example of this technique. The simulation in that article uses an input data set that contains

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The ‘virtual wall’ along the US/Mexican border

September 25, 2017
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Recent news reports indicate that the number of illegal immigrants apprehended along the US/Mexican border has dropped significantly since Trump took office. So, even though Trump hasn't had time to build a physical wall, perhaps there's a virtual wall...
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